How The West Was Won - Debbie Reynolds' Falling Dress Strap
Just before the Civil War scenes, Debbie Reynolds is talking to a man in her dance hall dressing room. Some of the shots are looking over her shoulder at the man. During one scene her right dress strap slips down to her bicep. Then when the shot changes to her front side, the strap is back up. Then it switches to down again, then up again.